199977728 has 18 divisors (see below), whose sum is σ = 399174804. Its totient is φ = 99988736.

The previous prime is 199977671. The next prime is 199977737. The reversal of 199977728 is 827779991.

199977728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390326 + ... + 390837.

It is an arithmetic number, because the mean of its divisors is an integer number (22176378).

Almost surely, 2^199977728 is an apocalyptic number.

It is an amenable number.

199977728 is a deficient number, since it is larger than the sum of its proper divisors (199197076).

199977728 is an frugal number, since it uses more digits than its factorization.

199977728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781179 (or 781165 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 59.

The square root of 199977728 is about 14141.3481676960. The cubic root of 199977728 is about 584.7818389290.

The spelling of 199977728 in words is "one hundred ninety-nine million, nine hundred seventy-seven thousand, seven hundred twenty-eight".